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Java User Input Essentials

bookReading Integers from User Input

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When you want to read an integer from the user in Java, you use the nextInt() method from the Scanner class. This method reads the next input token as an integer, allowing you to easily prompt the user for numbers such as age, quantity, or any other whole number value. The nextInt() method is a key part of handling numeric input in command-line Java applications.

Main.java

Main.java

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package com.example;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.print("Enter your age: ");
        int age = scanner.nextInt();

        System.out.println("You entered: " + age);

        scanner.close();
    }
}

When you use nextInt() to read input, the program expects the user to enter a valid integer. If the user enters something that is not an integer, such as a word or a decimal number, the Scanner will throw an InputMismatchException. This means your program will stop running unless you handle this situation. It is important to be aware of this behavior so you can design your program to deal with unexpected input gracefully.

question mark

Which Scanner method is used to read an integer value from user input?

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Sezione 2. Capitolo 1
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